Automatic centering device and method for the nozzle of continuous casting ladle

Abstract

The present invention discloses an automatic centering device and a method for centering the nozzle of a continuous casting tundish, and belongs to the technical field of continuous casting in the steel industry. An automatic centering device and a method for centering the nozzle of a continuous casting tundish include a continuous casting tundish body and a tundish car. The tundish car is located below the continuous casting tundish body, and a track is provided below the tundish car, and a crossbeam is provided inside the tundish car. In order to solve the problem that the position of the nozzle body cannot be directly detected, resulting in large errors in indirect measurement and cumbersome operations, during automatic production, the centering system compares the actual data on site with the initial data, thereby moving the position of the nozzle body through the centering control component, thereby ensuring that the nozzle body is in the center position, and the centering distance measuring component directly measures the position of the nozzle body at the baking position, so that the nozzle body can complete the centering operation at the baking position, shortening the casting preparation time and improving production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of continuous casting in the steel industry, and in particular to an automatic centering device and a centering method for a tundish nozzle in a continuous casting ladle. Background Art

[0002] In continuous casting, the centering accuracy of the tundish's submerged nozzle and the mold significantly impacts both the quality of the ingot and the smooth progress of casting. Currently, the alignment of the tundish nozzle and the mold relies primarily on manual measurement and adjustment, which is labor-intensive and results in low centering accuracy. Consequently, in actual production, the nozzle cannot be accurately inserted into the center of the mold, leading to an unstable flow field within the mold and affecting ingot quality. Severe deflection can even prevent the nozzle from aligning with the mold's top, impacting normal production. Therefore, it is necessary to develop an automatic centering device for the tundish nozzle of a continuous casting machine, based on a laser-based automatic measurement of nozzle centering deviation, and PLC-based calculation and adjustment. Automatic centering of the tundish nozzle can be achieved with the push of a button, reducing workload and improving centering accuracy and work efficiency. Due to the complex situation of the continuous casting steel pouring platform, the large number of operation intervention points, and the existence of interference environments such as high temperature, dust, and steel slag, the selection of automatic centering detection and adjustment equipment must take into account the impact of on-site environmental factors and the convenience of the operation process, select appropriate equipment components and determine the most suitable installation location for the centering equipment to realize the function of automatic centering device to detect deviation and adjust.

[0003] A novel search of existing related patents on automatic alignment of tundish nozzles for continuous casting was conducted, and the results are as follows:

[0004] Patent 1: Chinese patent publication number CN115502384A discloses an automatic centering device and method for a submerged tundish nozzle. The device utilizes a photoelectric rangefinder mounted on a lifting platform of a tundish car. A distance marker is set on the tundish. The distance light emitted by the photoelectric rangefinder is aligned with the distance target and parallel to the direction of centering movement. The photoelectric rangefinder is electrically connected to a centering control device, and a centering drive is controlled by the centering control device. The method includes the centering control device continuously receiving distance measurement signals from the photoelectric rangefinder and controlling the centering drive device based on the distance measurement values, causing the submerged nozzle to continuously move toward the center position, while the distance measurement value of the photoelectric rangefinder continuously approaches zero. The automatic centering device and method enable automatic centering of the submerged tundish nozzle, achieving minimal centering deviation, high accuracy, and rapid alignment.

[0005] Patent 2: Chinese patent publication number CN106647599B discloses a tundish centering detection and control system and method. The system includes a data acquisition unit comprising a laser rangefinder, a weight sensor, a level sensor, a coding cable, a 3D laser, and a camera. The output of the data acquisition unit is electrically connected to the input of a signal amplifier, which is in turn electrically connected to the input of an analog-to-digital converter (A / D converter), which is in turn electrically connected to the input of a programmable logic controller (PLC). This tundish centering detection and control system includes an alarm unit. If the lateral deviation of the tundish outlet is greater than or equal to the allowable lateral deviation of the tundish outlet, the longitudinal deviation is greater than or equal to the allowable longitudinal deviation of the tundish outlet, or the inclination angle of the tundish submerged nozzle exceeds the allowable installation angle for the submerged nozzle, an alarm is issued, directing manual or automatic control of the tundish vehicle to correct the deviation.

[0006] Patent 3: Chinese patent publication number CN116213653A discloses an online continuous detection device and method for submerged nozzle precision control. The device is mounted on the bottom of the tundish shell via a fixed bracket. Two rangefinders, laser rangefinder 1 and laser rangefinder 2, are mounted on the fixed bracket. A positioning iron block is mounted on the mold copper plate weight, parallel in length to the mold wide copper plate and vertically aligned with the position of laser rangefinder 1. A data collector is connected to the rangefinder and an electronic computer. This advantageous feature enables real-time monitoring of the submerged nozzle's insertion depth and alignment, providing a strong basis for continuous casting process optimization and precise process control, effectively improving product quality.

[0007] Among the above three patents, the automatic centering device and method for the submerged nozzle of the tundish described in Patent 1 is centered at the crystallizer position, and a ranging target is installed at the nozzle connection position for centering. There are problems of centering deviation caused by insufficient centering time and differences in nozzle installation, and the target needs to be calibrated to ensure accuracy.

[0008] The operating steps of Patent 2 are to analyze and calculate the signal using the measurement signal and the calculation module, and obtain the distance X1 of the nearest narrow side of the tundish relative to the reference point through the coding cable or the laser rangefinder; S3, from the tundish size information, obtain the distance X2 of the center axis of the corresponding water outlet of the tundish relative to the above-mentioned narrow side, and obtain the lateral address of the tundish outlet, and the distance X=X1+X2 of the center axis of the water outlet of the tundish relative to the reference point; obtain the lateral data X' of the crystallizer center axis corresponding to the tundish outlet, thereby obtaining the lateral deviation ΔX=XX' of the tundish outlet; obtain the lateral allowable deviation ΔX' of the tundish outlet, measure the tundish size for detection, and obtain the position of the water outlet by calculation.

[0009] Patent 3 sets a laser distance meter on the tundish to measure the vertical position distance of the positioning block on the crystallizer, and indirectly measures the nozzle centering position based on the pre-set fluorescent point. It cannot directly detect the nozzle centering deviation, and there are indirect measurement errors and cumbersome operations. In addition, a permanent magnet is used to adsorb the positioning iron block on the upper iron of the crystallizer copper plate. Due to the ferromagnetic material, it cannot meet the requirements of the current eddy current level meter. The laser rangefinder is installed at the bottom of the tundish shell and needs to be reinstalled after the tundish is replaced. The repeatability cannot be guaranteed, and the installation operation must be repeated every time the tundish is replaced, which increases the workload.

[0010] The above three patents have the problem that they cannot directly detect the position of the nozzle body, resulting in large indirect measurement errors and cumbersome operations; therefore, they do not meet existing needs. In this regard, this application proposes an automatic nozzle centering device and nozzle centering method for a continuous casting tundish. Summary of the Invention

[0011] The purpose of the present invention is to provide an automatic centering device and a centering method for the tundish water nozzle of a continuous casting. A centering and distance measuring component is arranged below the crossbeam of the tundish car, and a centering control component is arranged on both sides of the water nozzle body. After the operator manually centers it, the data measured by the centering and distance measuring component is input into the centering system. During automatic production, the centering system compares the actual data on site with the initial data, and thus moves the position of the water nozzle body through the centering control component, thereby ensuring that the water nozzle body is in the center position, which can solve the problems in the prior art.

[0012] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic centering device for a continuous casting tundish nozzle, comprising a continuous casting tundish body and a tundish car, wherein the tundish car is located below the continuous casting tundish body, a track is provided below the tundish car, a crossbeam is provided inside the tundish car, the continuous casting tundish body is located above the crossbeam, a centering and distance measuring component is provided below the crossbeam, a nozzle body is provided below the continuous casting tundish body, a centering control component is provided on the side of the continuous casting tundish body, a movable block is provided above the nozzle body, the movable block is connected to the nozzle body, and the movable block is connected to the continuous casting tundish body through a slide.

[0013] Preferably, a limiting plate is provided on the top of the tundish car, a fixed plate is provided on the limiting plate, a guide column is provided on the side of the fixed plate, one end of the guide column is connected to the fixed plate, and a positioning plate is provided on the other end of the fixed plate, and the side of the positioning plate is in contact with the continuous casting tundish body.

[0014] Preferably, at least two nozzle bodies are provided, and the two nozzle bodies are symmetrically distributed on both sides of the centering and distance measuring component, and centering control components are provided on both sides of the single nozzle body.

[0015] Preferably, the centering control assembly includes an L-shaped plate, a solenoid valve, a cylinder and a telescopic rod, one end of the L-shaped plate is connected to the continuous casting middle package body, the solenoid valve is located above the L-shaped plate, the cylinder is located inside the L-shaped plate, one end of the telescopic rod is connected to the cylinder, and the other end of the telescopic rod is connected to the movable block.

[0016] Preferably, the centering and ranging assembly includes a protective cover, an air pipe, an adjusting rod, a first laser outlet, a second laser outlet, a third laser outlet and a fourth laser outlet. At least four laser rangefinders are arranged inside the protective cover, and the four laser rangefinders are respectively connected to the first laser outlet, the second laser outlet, the third laser outlet and the fourth laser outlet.

[0017] A method for centering a tundish nozzle of a continuous casting ladle is implemented based on an automatic centering device for a tundish nozzle of a continuous casting ladle, and includes the following steps:

[0018] Step 1: The operator moves the tundish car to the casting position;

[0019] Step 2: The operator manually centers the nozzle body at the casting position;

[0020] Step 3: The operator records the data measured by the centering distance measuring component and enters the data into the centering system, while moving the trolley to the baking position;

[0021] Step 4: During automatic production, after the nozzle body is installed, the operator presses the centering button on the operation box of the middle ladle car at the baking position, and the centering control component moves the nozzle body to the center position;

[0022] Step 5: After the centering operation is completed, the centering indicator light on the operation box of the trolley will be on and the automatic production operation will begin.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention sets a centering and distance measuring component under the crossbeam of the mid-roller car, and sets a centering control component on both sides of the nozzle body. After the operator manually centers it, the data measured by the centering and distance measuring component is input into the centering system. During automatic production, the centering system compares the actual data on site with the initial data, and moves the position of the nozzle body through the centering control component to ensure that the nozzle body is in the center position. The centering and distance measuring component directly measures the position of the nozzle body at the baking position, so that the nozzle body can complete the centering operation at the baking position. Compared with the existing centering operation at the casting position, the casting preparation time is shortened and the production efficiency is improved.

[0025] 2. The present invention allows the operator to manually center the nozzle body in advance, and then automatically center it according to the manually centered position data, thereby improving the degree of automation in slab continuous casting production, reducing the labor intensity of operators, improving production efficiency, avoiding errors in manual measurement, and achieving precise centering effects. At the same time, it also avoids the situation where the nozzle body collides with the crystallizer and breaks, and reduces the incidence of abnormal production interruptions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an overall schematic diagram of the present invention;

[0027] Figure 2 This is a schematic diagram of the partial structure of the centering control component of the present invention;

[0028] Figure 3 This is a schematic diagram of the partial structure of the centering and ranging component of the present invention;

[0029] Figure 4 Schematic diagram of the laser irradiation direction of the present invention.

[0030] In the figure: 1. Continuous casting tundish body; 2. Tundish car; 201. Limit plate; 202. Fixing plate; 203. Guide column; 204. Positioning plate; 205. Crossbeam; 3. Track; 4. Centering and distance measurement assembly; 401. Protective cover; 402. Air pipe; 403. Adjusting rod; 404. First laser outlet; 405. Second laser outlet; 406. Third laser outlet; 407. Fourth laser outlet; 5. Nozzle body; 501. Movable block; 6. Centering control assembly; 601. L-shaped plate; 602. Solenoid valve; 603. Cylinder; 604. Telescopic rod. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In order to solve the problem that the position of the nozzle body cannot be directly detected, which makes the indirect measurement error large and the operation more complicated, please refer to Figure 1-4 , this embodiment provides the following technical solutions:

[0033] A device for automatically centering a continuous casting tundish nozzle comprises a continuous casting tundish body 1 and a tundish car 2. The tundish car 2 is located below the continuous casting tundish body 1, a track 3 is provided below the tundish car 2, a crossbeam 205 is provided inside the tundish car 2, the continuous casting tundish body 1 is located above the crossbeam 205, a centering and distance measuring component 4 is provided below the crossbeam 205, a nozzle body 5 is provided below the continuous casting tundish body 1, a centering control component 6 is provided on the side of the continuous casting tundish body 1, a movable block 501 is provided above the nozzle body 5, the movable block 501 is connected to the nozzle body 5, and the movable block 501 is connected to the continuous casting tundish body 1 through a slide.

[0034] Specifically, a limiting plate 201 is provided on the top of the tundish car 2, a fixed plate 202 is provided on the limiting plate 201, a guide column 203 is provided on the side of the fixed plate 202, one end of the guide column 203 is connected to the fixed plate 202, and a positioning plate 204 is provided on the other end of the fixed plate 202. The side of the positioning plate 204 is in contact with the continuous casting tundish body 1, and the positioning plate 204 connects the tundish car 2 with the continuous casting tundish body 1. The tundish car 2 reaches the casting position or baking position along the track 3, which limits the position of the continuous casting tundish body 1 and further reduces the position error during subsequent production.

[0035] At least two nozzle bodies 5 are provided, and the two nozzle bodies 5 are symmetrically distributed on both sides of the centering and distance measuring component 4. A centering control component 6 is provided on both sides of a single nozzle body 5. The centering control component 6 includes an L-shaped plate 601, an electromagnetic valve 602, a cylinder 603 and a telescopic rod 604. One end of the L-shaped plate 601 is connected to the continuous casting middle package body 1, the electromagnetic valve 602 is located on the top of the L-shaped plate 601, the cylinder 603 is located inside the L-shaped plate 601, one end of the telescopic rod 604 is connected to the cylinder 603, and the other end of the telescopic rod 604 is connected to the movable block 501.

[0036] Specifically, during the entire process of automatically centering the nozzle body 5, the position of the nozzle body 5 is fine-tuned by controlling the opening time of the solenoid valve 602. Each time the solenoid valve 602 is started, it runs for 0.2 seconds and stops for 3 seconds until the nozzle body 5 moves to the center position, further reducing the error of the nozzle body 5 in the center position.

[0037] The centering and ranging assembly 4 includes a protective cover 401, an air pipe 402, an adjusting rod 403, a first laser outlet 404, a second laser outlet 405, a third laser outlet 406 and a fourth laser outlet 407. At least four laser rangefinders are arranged inside the protective cover 401, and the four laser rangefinders are respectively connected to the first laser outlet 404, the second laser outlet 405, the third laser outlet 406 and the fourth laser outlet 407.

[0038] Specifically, the centering distance measuring component 4 is installed under the crossbeam 205, and the protective cover 401 prevents the laser rangefinder from being affected by external factors such as dust and steel slag on site. Cooling air can be transported to the inside of the protective cover 401 through the air pipe 402 to prevent high temperature on site from damaging the equipment, further ensuring measurement accuracy and service life.

[0039] Specifically, the No. 1 laser rangefinder emits a ranging laser a to one side of the outline of the odd-numbered water outlet body 5 through the first laser outlet 404, and the No. 2 laser rangefinder emits a ranging laser b to the other side of the outline of the odd-numbered water outlet body 5 through the second laser outlet 405; the No. 3 laser rangefinder emits a ranging laser c to one side of the outline of the even-numbered water outlet body 5 through the third laser outlet 406, and the No. 4 laser rangefinder emits a ranging laser d to the other side of the outline of the even-numbered water outlet body 5 through the fourth laser outlet 407. After the operator manually centers the water outlet body 5, the values ​​of the ranging lasers a, b, c and d are recorded, and the difference between the ranging laser a and the ranging laser b is used as the initial calibration value B1 for the centering of the odd-numbered water outlet, and the difference between the ranging laser c and the ranging laser d is used as the initial calibration value B2 for the centering of the even-numbered water outlet, and then the initial calibration value B1 and the initial calibration value B2 are input into the centering system.

[0040] During automatic centering, first move the odd-numbered nozzle body 5 and the even-numbered nozzle body 5 to the position where the ranging lasers a, b, c and d have values, and then fine-tune the position of the nozzle body 5. Fine-tune by comparing the actually measured values ​​of the ranging lasers a, b, c and d on site with the initial calibration values. If the difference between the existing ranging laser a value and the existing ranging laser b value is less than the initial calibration value B1, the odd-numbered nozzle body 5 moves toward the ranging laser b direction. If the existing ranging laser a value is subtracted from the existing ranging laser b value, the difference is less than the initial calibration value B1. When the value of the distance laser a is subtracted from the existing distance measuring laser b, the difference is greater than the initial calibration value B1, then the odd nozzle body 5 moves toward the distance measuring laser a. When the value range of the difference minus the initial calibration value B1 is within ±1mm and lasts for more than two seconds, it means that the odd nozzle body 5 is in the center position. Similarly, the even nozzle body 5 is centered. When the two nozzle bodies 5 are centered, the centering indicator light in the operation box on the middle package car 2 is always on, indicating that the automatic centering is completed.

[0041] During the actual automatic centering operation, the laser rangefinder collects a value every 0.1 seconds, and ten sampling values ​​are generated within one second. The average of the ten sampling values ​​is taken as the value of the ranging laser for that second, reducing the influence of the surrounding environment on the laser rangefinder, causing slight jitter of the laser rangefinder and fluctuation of the ranging value.

[0042] An automatic centering button is provided in the operation box on the middle package car 2. After the operator presses the automatic centering button at the baking position, the nozzle body 5 starts the centering operation. At this time, the centering indicator light flashes. When the centering operation is completed, the centering indicator light is always on. When the centering operation fails, the centering indicator light is off. When the middle package car 2 is not in the baking position, the centering indicator light goes out and automatically resets. When the centering operation is to be performed next time, the automatic centering button needs to be pressed again. The centering distance measuring component 4 directly measures the position of the nozzle body 5 at the baking position, so that the nozzle body 5 can complete the centering operation at the baking position. Compared with the existing centering operation at the casting position, the casting preparation time is shortened and the production efficiency is further improved.

[0043] A method for centering a tundish nozzle of a continuous casting ladle is implemented based on an automatic centering device for a tundish nozzle of a continuous casting ladle, and is characterized by comprising the following steps:

[0044] Step 1: The operator starts the tundish car 2, which drives the continuous casting tundish body 1 to move along the track 3 to the casting position;

[0045] Step 2: The operator manually performs the centering operation of the nozzle body 5 at the casting position;

[0046] Step 3: The operator records the initial calibration value B1 and the initial calibration value B2 measured by the centering distance measuring component 4 and inputs the data into the centering system, while moving the trolley 2 to the baking position;

[0047] Step 4: During automatic production operation, after the nozzle body 5 is installed, the operator presses the centering button on the operation box of the middle ladle car 2 at the baking position. The centering system compares the existing data measured by the centering distance measuring component 4 with the initial calibration value B1 and the initial calibration value B2. The centering control component 6 activates the solenoid valve 602 according to the comparison result to fine-tune the position of the nozzle body 5 until the nozzle body 5 is moved to the center position;

[0048] Step 5: After the centering operation is completed, when the centering indicator light on the operation box of the tundish car 2 is always on, start the tundish car 2, and the tundish car 2 drives the continuous casting tundish body 1 to move along the track 3 to the casting position, and start the automatic production operation.

[0049] Working principle: A centering and distance measuring component 4 is set below the crossbeam 205 of the mid-pack car 2, and a centering control component 6 is set on both sides of the nozzle body 5. After the operator manually centers the nozzle, the data measured by the centering and distance measuring component 4 is input into the centering system. During automatic production, the centering system compares the actual data on site with the initial data, and then fine-tunes the position of the nozzle body 5 through the centering control component 6 to ensure that the nozzle body 5 is in the center position. The centering and distance measuring component 4 directly detects the position of the nozzle body 5, ensuring the centering precision and accuracy.

[0050] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0051] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An automatic centering device for a continuous casting tundish nozzle, comprising a continuous casting tundish body (1), characterized in that: It also includes a middle ladle car (2), the middle ladle car (2) is located below the continuous casting middle ladle body (1), a track (3) is provided below the middle ladle car (2), a crossbeam (205) is provided inside the middle ladle car (2), the continuous casting middle ladle body (1) is located above the crossbeam (205), a centering distance measuring component (4) is provided below the crossbeam (205), a nozzle body (5) is provided below the continuous casting middle ladle body (1), a centering control component (6) is provided on the side of the continuous casting middle ladle body (1), a movable block (501) is provided above the nozzle body (5), the movable block (501) is connected to the nozzle body (5), and the movable block (501) is connected to the continuous casting middle ladle body (1) through a slideway; The nozzle bodies (5) are provided with two, and the two nozzle bodies (5) are symmetrically distributed on both sides of the centering distance measuring component (4). Both sides of the nozzle body (5) are provided with a centering control component (6); the centering control component (6) comprises an L-shaped plate (601), an electromagnetic valve (602), a cylinder (603) and a telescopic rod (604), one end of the L-shaped plate (601) is connected to the continuous casting tundish body (1), the electromagnetic valve (602) is located above the L-shaped plate (601), the cylinder (603) is located inside the L-shaped plate (601), and one end of the telescopic rod (604) is connected to the cylinder (60 3) connection, the other end of the telescopic rod (604) is connected to the movable block (501); the centering distance measuring component (4) includes a protective cover (401), an air pipe (402), an adjusting rod (403), a first laser outlet (404), a second laser outlet (405), a third laser outlet (406) and a fourth laser outlet (407), and at least four laser rangefinders are arranged inside the protective cover (401), and the four laser rangefinders are respectively connected to the first laser outlet (404), the second laser outlet (405), the third laser outlet (406) and the fourth laser outlet (407).

2. The automatic centering device for the tundish nozzle of continuous casting according to claim 1, characterized in that: A limiting plate (201) is provided on the top of the tundish car (2), a fixing plate (202) is provided on the top of the limiting plate (201), a guide column (203) is provided on the side of the fixing plate (202), one end of the guide column (203) is connected to the fixing plate (202), and a positioning plate (204) is provided on the other end of the fixing plate (202), and the side of the positioning plate (204) is in contact with the continuous casting tundish body (1).

3. A method for centering a tundish nozzle of a continuous casting ladle, implemented based on the automatic centering device for a tundish nozzle of a continuous casting ladle according to any one of claims 1 to 2, characterized in that: The following steps are involved: Step 1: The operator moves the tundish car (2) to the casting position; Step 2: The operator manually centers the nozzle body (5) at the casting position; Step 3: The operator records the data measured by the centering distance measuring component (4) and inputs the data into the centering system, and at the same time moves the middle package car (2) to the baking position. The specific operation steps are as follows: the No. 1 laser distance meter emits a distance measuring laser a to one side of the outline of the odd-numbered nozzle body (5) through the first laser outlet (404), and the No. 2 laser distance meter emits a distance measuring laser b to the other side of the outline of the odd-numbered nozzle body (5) through the second laser outlet (405); the No. 3 laser distance meter emits a distance measuring laser b to the other side of the outline of the even-numbered nozzle body (5) through the third laser outlet (406). The distance measuring laser c is emitted from one side of the nozzle body (5), and the fourth laser rangefinder emits a distance measuring laser d to the other side of the contour of the even-numbered nozzle body (5) through the fourth laser outlet (407). After the operator manually centers the nozzle body (5), the values ​​of the distance measuring lasers a, b, c and d are recorded, and the difference between the distance measuring laser a and the distance measuring laser b is used as the initial calibration value B1 for the centering of the odd-numbered nozzle, and the difference between the distance measuring laser c and the distance measuring laser d is used as the initial calibration value B2 for the centering of the even-numbered nozzle, and then the initial calibration value B1 and the initial calibration value B2 are input into the centering system; Step 4: During the automatic production operation, after the nozzle body (5) is installed, the operator presses the centering button on the operation box of the middle package car (2) at the baking position, and the centering control component (6) moves the nozzle body (5) to the center position. The specific operation steps are as follows: During the automatic centering, first move the odd nozzle body (5) and the even nozzle body (5) to the position where the ranging lasers a, b, c and d have values, and then fine-tune the position of the nozzle body (5). The actual measured values ​​of the ranging lasers a, b, c and d are compared with the initial calibration values ​​to achieve fine-tuning. If the existing ranging laser a value is subtracted from the existing ranging laser b value, When the difference is less than the initial calibration value B1, the odd nozzle body (5) moves toward the distance measuring laser b. If the difference between the existing distance measuring laser a value and the existing distance measuring laser b value is greater than the initial calibration value B1, the odd nozzle body (5) moves toward the distance measuring laser a. When the difference minus the initial calibration value B1 is within the range of ±1mm and lasts for more than two seconds, it means that the odd nozzle body (5) is in the center position. Similarly, the even nozzle body (5) is centered. When the two nozzle bodies (5) are centered, the centering indicator light in the operation box on the middle package car (2) is always on, indicating that the automatic centering is completed. Step 5: After the centering operation is completed, the centering indicator light on the operation box of the middle package vehicle (2) is always on, and the automatic production operation begins.

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